Online Education For Gem Enthusiasts

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2,140 Articles
6,170 Members
109 Directory Listings
129,619 Followers

The world's best gem articles, published weekly.

Most Recent Articles

What is a Trapiche Emerald?

Trapiche emerald gems are some of the world’s rarest emeralds. Learn where they’re found and how their characteristic “spoked wheel” patterns are formed.

Hurlbutite Value, Price, and Jewelry Information

Hurlbutite is an extremely rare mineral. Minute, colorless faceted stones have been cut from fragments.

A Consumer’s Guide to Gem Grading

Learn how gemologists evaluate color, clarity, cut, and carat for gem grading. Consumers can use this information to find the right stone for their needs.

A Guide to Understanding the Inner Workings of the Gem Trade

Based on interviews with gem trade experts, this series of FAQs addresses many topics, such as gem value, investing, insurance, and collecting.

What are Allochromatic and Idiochromatic Gems?

Learn the difference between allochromatic and idiochromatic gems and why some gem species can occur in many color varieties and others occur only in one.

Sphalerite Buying Guide

Our sphalerite buying guide can help you learn how these gems are graded, what to avoid, and how to identify a high quality stone or a bargain in the rough.

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"Becoming a Pro Member of IGS just made good sense for my business. The gemology resources are fantastic, and my profile lets potential customers know I am serious about colored gemstones. And frankly, if I get any exposure to potential customers it's a no-brainer."
Paul Bierker, Paul Michael Designs
Jeweler, IGS Pro Member

The world's best online resource for gemstone appraisal

Over 15 years, we have assembled detailed pricing and value information for appraising over 70 different gemstones. The values in our guide come from a variety of sources including primary and secondary gemstone dealers, jewelers, miners, and wholesale suppliers of commonly traded gemstones.

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